[5] The flow moved northward and eastward from the vent over a terrain with slopes of 3-4°.

Steep 200-metre (660 ft) high flanks limit the flow, which has a total volume of 4 cubic kilometres (0.96 cu mi).

It is surrounded by a pumice deposit probably from the San Pedro volcano to the northwest.

[5] The eruption of the Chillahuita dome involved the entry of andesitic magma into a pre-existent shallow reservoir.

[4] It appears to have been controlled by local fault systems associated with the Altiplano-Puna volcanic complex, which also has geochemical similarity with Chillahuita lavas.